<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数</title>
    <script>
            function sum(a,b){
                // console.log(d);
                return a + b ;
            }

         sums =  sum(10,20);
        console.log(sums);

    </script>
</head>
<body>
    
</body>
</html>